Ok, so if your talking about the OS command console, that's just bringing up run and typing cmd. From that console, how would the system / os (windows) know what to do if one simply typed -checkblocks=1 ?
If one has a system running say litecoin and bitcoin, how would the OS know where to send the command if one just...
start > run > cmd > -checkblocks=1
Not at all, your actually pretty close to the mark.
Luckily Youtube is your friend:
4 part cmd tutorial
https://www.youtube.com/watch?v=8-Bnm9LxG6ABasically:
0) Close bitcoin program and wait 60 seconds.
1) go to c:\Programs Files (x86)\Bitcoin
2) Shift click (like on the video) for "Command Prompt Here"
3) Type (no quote) "Bitcoin-Qt -checkblocks=1 -checklevel=0 -splash=0 -listen=0